Process Control
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What is Protective system Override ? & What is Protective Override switch (POS)?
What is Protective system Override? If two or more circumstances are met at the same moment, command override is used…
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Process switches and alarms
Introduction Another type of instrument commonly seen in measurement and control systems is the process switch. The purpose of a switch…
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What is proportional, integral and derivative control?
Introduction The aim of this unit is to describe the use of proportional, integral and derivative control. The course also…
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PLC program for a batch process
Introduction Hey guys in this session we are gonna discuss about a PLC program for a batch process.In my earlier…
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What are Open Loop & Closed Loop system
Introduction There are two types of control systems namely Open Loop & Closed Loop system …
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Working of an Override Control
Introduction The override control concept is a technique by which process variables are kept with in certain limits, usually for protective purposes. Override control maintains the process in operation but within and under safer conditions. Override control To illustrate override control, consider the simple process shown in Figure A hot, saturated…
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How does a process control work?
Introduction. Process control is the automatic control of an output variable by sensing the amplitude of the output parameter from…
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WHAT IS ADAPTIVE CONTROL?
ADAPTIVE CONTROL Adaptive control is a method whereby the gain of a system can be varied depending on the position…
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Pressure Relief valves
Overview: The Relief valves are safety valves prevent equipment damage by relieving accidental over-pressurization of fluid systems. The relief valves…
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BASICS OF AN INSTRUMENT AIR SUPPLY SYSTEM
Introduction The air used must be cleaned, dry and oil-free to ensure that small lines, restrictions and nozzles will not…
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